Self-locking carabiner

A carabiner comprising an essentially C-shaped load-bearing hook member extending in a plane and having a first end and a second free end, a closing member having a first free end and a second end attached to the first end of the hook member, the closing member being pivotable about the first end of the hook member in the plane of the hook member between an open position and a closing position, first spring means for biasing the closing member into the closing position in which the free end of the closing member rests against the free end of the hook member, the hook member comprising a hook portion at the free end thereof, the hook portion having an inner surface, a two-armed lever pivotally attached to the inner surface of the hook portion, the two-armed lever being pivotable about an axis extending perpendicularly to the plane of the hook member, the two-armed lever corresponding in shape essentially to the hook portion and comprising a first arm facing the free end of the hook member and a second arm facing away from the free end of the hook member, second spring means for biasing the lever into a first position in which the first arm of the lever rests against the inner surface of the hook portion and the second arm is spaced from the inner surface of the hook portion in the unloaded state of the carabiner, wherein, when the lever is pivoted against the force of the second spring means, an end face of the first arm of the two-armed lever projects into a pivoting range of the free end of the closing member when the closing member is in the closing position.